Baader Planetarium Multi Purpose Coma Corrector 2" MPCC No Magnification Increase: The MPCC delivers full fields for the widest 2" eyepieces. Why spend the No additional Back-Focus (in-travel) Required: In fact, in direct-coupled configurations, the MPCC a Reduced Vignetting: The MPCC works well with even the largest true field 2" eyepieces. Due the close Low Cost: The MPCC is about half the cost of other correctors. Some users have even purchased more t